Safety appliance for elevator cars



Jul 8, 1924. 1501,024 S. L. MCKINNEY SAFETY APPLIANCE FOR ELEVATOR CARS Filed May 21, 1923 INVENTOR.

Elifffizma -ATTORNEY.

Patented July 8, 1924.

SAIVIUEL L. MQKINNEY, OF PEOBIA, ILLINOIS, ASSIGNOB TO ELEVATOR LOCKS (10;,

A COB-FORATION OF ILLINOIS.

SAFETY APPLIANCE FOB. ELEVATOR GAE/S.

Application filed May 21,

To all whom it may concern:

Be it known that I, SAMUEL L. MOKIN- NEY, a citizen of the United States, residing at Peoria, in the county of Peoria and State of Illinois, have invented new and useful Improvements in Safety Appliances for Elevator Cars; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to safety appliances for elevators, relating more particularly,

however, to means for holding and preventing movement of the starting cables of elevators stationed opposite open shaft doors.

The object of the invention is to provide a new and novel structure to be attached to an elevator-car for either passenger or freight use by which to grip the cable used to start and stop said car to the end that perfect safety to persons in or about the car is assured.

In bringing out my invention I am fully aware of various patented devices used for grasping the starting cables of elevator-cars but my device is believed to be new in form, it is exceedingly simple, absolutely positive in operation and thoroughly practical.

To the end that the invention may be un derstood I have provided the accompanying drawing wherein,

Figure 1 shows my elevator-car attachment in perspective and in its cable engag ing position.

Figure 2 is a plan of the same on a reduced scale with parts shown in section.

Figure 3 shows a cable gripping block in perspective.

Figure 4 is a side elevation of some of the parts shown in Figure 2, and

Figure 5 is also a side elevation of parts shown in Figure 1 on a larger scale and in a different position.

The wall of the elevator-car is designated in Figure 1 by the numeral 1, the side thereof within the car being that illustrated. Secured to the wall is a plate 2 forming a mounting for parts now to be described. That is to say, secured to and extending from the said plate 2 substantially at right angles to the plane of the wall 1 is a fixed block 3 lying adjacent the operating cable 4: and grooved at 5, Figure 2. Extending furcated and receives between the bifurca-.

tions a cam 9 operated by a lever-arm 9. Said arm engages the gripping block 7 and is adapted to force it into engagement with the cable, this position being shown in Figures 1, 2 and 4.

The said cam 9 rocks upon a bolt 10 extending through the bifurcations of the housing 6, and the plate 2. Carried by the cam is an arm 11 rigid therewith and having a roller 12 at one end which engages the cross-head 13 of a rod 141 having connection with certain mechanism, not shown, used for releasing certain door locking parts not shown herein since forming no part of the present invention in themselves. It may be here stated, however, that the whole purpose of this invention is to secure the cable against movement when any one of the shaft-doors stands open opposite the elevator-car and that the mechanism controlled by the door will release the cable only when and as the door is closed. Further, that when the door is open the mechanism controlled thereby prevents the operator from manually releasing the cable.

It is to be noted that the roller 12 depresses the cross-head 13 wheneverthe'cam 9 causes the block 7 to grip the cable, the shaft-door, not shown, being thereby released so that it can be opened.

Extending from the lever 9' is an arm 15 which when it lies in the position shown in Figure 1 is prevented being 'moved to release the cable by being blocked in such movement through a rock-arm 16 pivoted between ears 17, for example, on the plate 2 one end of the arm having connected to it a rod 18 adapted to be operated by the floor-door, when opened, thereby moving the other end of the arm into the path of the said arm 15 or some other part movable with the cam. 1 show the locking position of the rockarm 16 to prevent movement of the cam.

When the shaft door is closed the arm 16 is automatically raised from the path of the arm 15 whereupon the cam can be swung The dotted lines in Figure to bring about the release of the cable through the removal of sliding block 7.

The structure shown and described provides a very positive grip and is applicable to all types of cars using a cable, and the safety of life is assured since power cannot be thrown into action to start the car While an entrance door stands open or even ajar, nor can a door he opened to expose the elevator shaft unless the car is at the landing carrying that particular door.

1. In an elevator appliance of the nature described, the combination with an elevatorcar and an operating cable, of a fixed part pressure upon the and a shiftable part on thecar adapted to travel adjacent to and at opposite sides of the cablein the movement of the car, a cam to engage and move the shiftable part against the cable for clamping it against said fixed part, an arm included with said cam, and a pivotally mounted rocking memher on the car capable of being moved into and out of the path of movement of the said arm.

2. In an elevator appliance of the nature described, the combination with an elevatorcar and an operating cable, of a lever including a cam, a fixed part positioned adjacent the cable, a shiftable part lying at the opposite side of the cable from the fixed part and between the cable and said cam and operated by the latter to engage said cable, a housing enclosing and guiding the shiftable part and pivotally supporting the lever and cam, and an arm pivoted on the car adapted to be operated to hold the cam in gripping engagement with the shiftable part. a

3. In an elevator appliance of the nature described, the combination with an elevatorcar and a starting cable therefor, of a fixed part extending from the wall of the car and lying adjacent the cable, a housing extending from the part, a part guided in said housing adapted to frictionally engage the cable and to hold the latter against the fixed part, a cam pivoted to the housing in position to engage the guided part and ineluding a lever, and an arm pivoted on the car adapted to be operated to engage behind the lever when the cam has moved the,

said guided part into engagement with the cable.

In vtestimony whereof I affix my signature in presence of two Witnesses.

SAMUEL L. MQKINNEY. lVitnesses:

H. HAROLD HART, L. M. THURLOW. 

